package com.lagou.edu.mvcframework.servlet;

import com.lagou.edu.factory.ProxyFactory;
import com.lagou.edu.utils.JsonUtils;
import com.lagou.edu.pojo.Result;
import com.lagou.edu.service.TransferService;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * @author 应癫
 */
@WebServlet(name = "transferServlet", urlPatterns = "/transferServlet")
public class TransferServlet extends HttpServlet {

    //1. 实例化service层对象
    //private TransferService transferService = new TransferServiceImpl();

    //2. 解决new关键字,从Ioc容器中获取对象
    //private TransferService transferService = (TransferService) BeanFactory.getBean("transferService");

    //3. 生成业务层动态代理对象,实现事务控制
    //private ProxyFactory proxyFactory = (ProxyFactory) BeanFactory.getBean("proxyFactory");
    private TransferService transferService;

    @Override
    public void init() throws ServletException {
        //此时我们在web.xml中配置监听器以及启动ioc容器,现在从spring中的ioc容器中获取实例化对象
        //spring提供的工具,在web环境获取Application
        WebApplicationContext webApplicationContext = WebApplicationContextUtils.getWebApplicationContext(this.getServletContext());
        ProxyFactory proxyFactory = (ProxyFactory) webApplicationContext.getBean("proxyFactory");
        transferService = (TransferService) proxyFactory.getJdkProxy(webApplicationContext.getBean("transferService"));
    }

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doPost(req, resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

        // 设置请求体的字符编码
        req.setCharacterEncoding("UTF-8");

        String fromCardNo = req.getParameter("fromCardNo");
        String toCardNo = req.getParameter("toCardNo");
        String moneyStr = req.getParameter("money");
        int money = Integer.parseInt(moneyStr);

        Result result = new Result();

        try {
            // 2. 调用service层方法
            transferService.transfer(fromCardNo, toCardNo, money);
            result.setStatus("200");
        } catch (Exception e) {
            e.printStackTrace();
            result.setStatus("201");
            result.setMessage(e.toString());
        }

        // 响应
        resp.setContentType("application/json;charset=utf-8");
        resp.getWriter().print(JsonUtils.object2Json(result));
    }
}
